Dynamo-electric machine



Aug. 8, 1933. H. L. SMITH ET AL DYNAM ELECTRIC MACHINE Filed May 9, 1929 2 Sheets-Sheet l Zia/@Iliana ug- 8, 1933. H. L, sMlT-H Er AL 1,921,845

DYNAMO ELECTRIC MACHINE Filed May 9. 1929 2 Sheets-Sheet 2 FIG. 4.

f f 32 j 5 7 Z 29 FIG. j?

Z9 35 W fi L l/ 'Jlll fwith a laminated core having its laminations ini- Patented Aug. 8, 1933 UNITED sra-rss rarENr" orricI-z Y,

v v I, 1,921,845 Y DYIQJAM@-ELECTRlCMACI-IINE Harold L. Sm v J. Ratlibun, and Alfred Forman, 1V Wis., assignorsto The Louis Allis Company, Milwaukee, Wis., a, Cor poration of lllisconsinv Appucantnnaye, 1929, serial No. 361,770, anain Canada April 27, 1928Y .l

s claims. (01.'172-36) arranged upon the other end thereof and formingrwith the core a closed inner casing to exclude This application is a continuation of application Serial No. 258,298, ledV March 1, 1928, as to matter common to both applications;

The invention relates to dynamo-electric ma chines.

The dynamo-electric machine to which the invention applies in particular is of the type which is provided with a closed casing to exclude ainbient difusible matter vfrom'th'e interiorthereoi.

The invention' has as lan object to provide an enclosed dynamo-electric machine in which its efciency for a given size core'is increased under the same operating conditions.

Another object is to provide an enclosed dynamo-electric machine from which heat 'is rap idly dissipated. K

Another object is to provide an enclosed dynamo-electric machinewhich is efficient, sturdy and compact..

Another object is to provide a dynamo-electric machine which may be readily and economically manufactured. v

According to the invention in its general aspect and as ordinarily embodiedin practice, thedynamo-'electric machine has its stator provided motor.

The core 1 has a rotor core 4 arranged therein and 7 arranged, respectively, in the end' plates 2 and 3. i

rlhe stator core 1 `is preferably a completelunit which carries the usual 'windings `8 and has its laminae 9 bound together between two end rings 10 by a thin metal shelly 11.

are welded to the shell 11 which is in intimate contact with the peripheries of the lamin and may be Welded thereto.

sist of strips spaced around the periphery ofthe Core' A, i .1

`The ends of the rings 10 and theren'ds of the therebetween whichl are preferably angular in cross-section.

Each end ring is shaped to provide upon the outside thereof yan annular surface 14 and a shoulder 15.'l

Each endplateis shapedat its inner end 16 to provide upon the inside thereof an annular surface 17 andv a shoulder 18 The annular surfaces co-act with each other to formatight joint and to andthe stator core. ,l

The end 13 may abut :the shoulder 18, the end 16 abut the shoulder 15, or each end abut a shou1 der to limit the inward movement ofV the end plates and form a tight joint.

perforate between its winding slots and its outside and bound together between two 'end rings by a binding joined to the end rings and engaging the outer edges of the laminations, a closed' end plate arranged upon each end ring and fastenedin a firm position thereon, a rotor arranged within the stator and carried by a shaft having a bearing in eachend plate, a ventilating casing arranged around the inner casing, and afan to cause external air to pass through the Ventilating casing in contact with the stator core;

The invention is exemplified by the electric motors illustrated in the accompanying drawings in which the viewsare as followsz* Y Fig. 1 is a side view, partly in central section, of an enclosed ventilated motor. i

Fig. 2 is an end View thereof, partly in section.

Fig. 3 is a detail view.

Fig. 4 is a viewsimilar to Fig. 1 showing different means for securing the several parts oi the motor case to each other.

Fig, 5 is an end View, partly in section,l of the motor shown in Fig. 3. Y

Fig. 6 is a detail view.

Figs.1to3., y'

The motor has its stator provided with a laminated core 1 having aclosed end plate 2 arranged upon one end thereof and a closedY end plate 3 therein to secure the end plates and the stator core together vand formy a closed casing to excludezambient diffusible matter from the interior of the machine. j e Y.

The'outside diameter of the stator coremay be reduced to theminimum as the laminas are imperforatebetween'the Winding slotsand the out-k f lside of the core. Consequently, the distance fromY -side of the machine is short and heat generated by the machineV is rapidly dissipated through the stator core. 1,

As the shellll isvvery thin and in intimate contact with the laminas, dissipation' of heat is not materially impeded thereby.

In order to provide more rapid dissipationrof heat, the motor isprovided with an outer or Ventilating casing 20 which is opena't'oneend ambient difusible matter from the interior of the y The end rings 10 abut the outer lamin and` upon a shaft 5 which is carried in bearings 6 i The shell 11 may be eithera cylinder or conend plates are shaped to providev tight joints 12 The end rings have elongated bolts 19 threaded the inner periphery of the statorl core to the outand spaced from the closed casing to form a Ventilating passage 21 through which air is forced by a fan 22 carried by the shaft 5.

The air is drawn into the casing 20 through an inlet 23 by the fan 22, passedA over 'the periphery of the core 1 to cool the. same, and discharged from the openend of the casing.

The closing casing is supported in theouter casing by lugs 24 which are carried by the .corev 1 and secured by bolts 25 to bosses 26 formed in the outer casing. i

Figs. 4 to 6.

The motor shown in Figs. 4 that shown in Figs. 1 and 2 only in the manner in which the lamin of the stator core are held together and the manner in which the end plates and stator core` are connected.

The laminas 9 are fastened togetherby strips of weldingg2'7 spaced around the periphery of the stator core 28. Theenjdvplates and the vstator core are held together by bolts 29which extend through lugs 30 on the end plate 31 and are threaded into lugs .32 on the endplate 33.

The, end piates 31 andes are prvidec withV annular flanges 34 which are shaped to form tight joints with the stator ,core 28.

Lugs 35 may bespacedaround the inner ends of the end plates 3:1 and'BS -to engage the periphery of the core 28 and aline the end plates therewith when assembling the motor.

p. The strips of wading- 27 may be faced atthe ends thereof to provide uniform contact, surfaces for thelugs 35, as shown in Fig. 4, or the lugs 35 may engage the periphery of the core intermediate the strips of welding 27, asshown in Figs. `5 and 6.2

The invention herein set forth is susceptibleV of Variousmodifications without departing from the scopethereof as hereafter claimed.

The invention-is `claimed as follows:

1.- An enclosed dynamo-electric machine, co1n-k prising a stator providedV with a Vlin'iinated core having its lamin imperforate between its winding slots and its outside, an end ring varranged upon each endjof said core, a binding arranged vacross said lamina in engagement withthe outside edges thereof andconnected to `said end e rings to securesaid laminas between the same, a closed endk plate arranged .upon each `end ring and forming therewith a closed inner casing, means to securersaid end plates in position upon Asaid core, a rotor 'arranged within said core and having its shaft bearing` insaid end plates; and a Ventilating casing arranged around said corerto enclose a Ventilating lpassage for the circulation of 'external air oversaid core. y Y Y 2. An enclosed dynamo-electric machine, comprising-astator provided with a laminated core having its laminas imperforate between its winding slots and its outside, an. end ring arranged upon each end of said core, a thin metal plate arranged across said laminas in vengagement with the outside edges thereof and connected to said end rings to secure said laminbetween the same, a closedendplate arranged upon eachv end ring Yand forming ltherewith a closed inner casing,

means to secure said end plates in position upon said core, a rotor arranged within saidcore and having its shaft bearing in saidv end plates, and a Ventilating casingwarranged around said core to enclose a Ventilating passage for the circulation of vexternal air 'over said core. 3. An enclosed dynamo-electric machine, com prising a stator provided with a laminated core and 5 differs froml inner casing, means to secure said end plates in l position upon said core, a rotor arranged within said core and having its shaft bearing in said end plates, and a Ventilating casing arranged around said core to enclose a Ventilating passage for the circulation of external air over said core.

4. An enclosed dynamo-electric machine, comprising a stator provided with a laminated core having its lamin imperforate between its winding slots and itsoutside,.an end ring arrangedA upon each end of said core, a thin metalplate arrangedv across said laminas in engagement with the outside edges thereof and connected to said end rings yto secure said laminas between the same, a-closed end plate arranged upon each end ring and forming therewith a closed inner casing, r,

means external to the laminee of said core to secure said end plates in position upon'said core, a rotor arranged Within said core and having its shaft bearing in said end plates, and a Ventilating casing arranged around said core to enclose;

a Ventilating passage for the circulation of external air over said core. I

5. An enclosed dynamo-electric machine, com

prising a stator provided with a laminated corehaving itslaininae imperforate between its winding slots and itsvoutside, an end ring arranged upon eachvend of said core, a thinl metal plate arrangedacross lsaid laminas in engagement withV the outside edges thereof and connected to said end rings to secure said laminas between the saine, if 1 a closed end plate arranged upon each end ring and forming therewith a closed inner casing, bolts threaded into said end rings to secure said end plates in position upon said core, Aa rotor arranged within said vcore and having its shaft* bearingy in said end plates, and a Ventilating casing 'arranged around'said core'toenclose a ven-l tilating passage for the circulation of4 external air over said core. f

, 6. An enclosed dynamo-electric'machine, coin- "prising a stator provided with a laminated core having its laminas imperforate between its winding slots and its outside, an end ring arranged upon each end kof said core, a thinmetal plate arrangedacross said laminas in engagement with Ythe outside edgesthereof and'connected to said end rings to secure said lamin between the same, a closed end platev arranged upon each end ring and forming therewith a closed inner casing,

means arranged externally of the` laminar of said core to secure saidend platesV in position; upon said core, a rotor arranged within said core and having its shaft bearing in said endplateaand K a unitary Ventilating casing arranged around said core to enclose a Ventilating passage forthecir--f cuiation of external air over said coreandforming a supportv for said'core. l

'7. A dynamo-electricV machine, comprising la stator provided with a laminated core 4hav-ing an end ring arranged upon each end thereof `and a shell arranged around the outer edgesof its laminations in engagement therewithV and overland-v ping said end rings and welded 'to"theouter peripheries thereof, .a closed'end plate arranged e upon each ofy said end rrings and forming with said stator a closed inner casing to exclude ambient diiusible matter from the interior of said machine, a rotor arranged Within said stator and having its shaft bearing in said end plates, an outer casing arranged around said inner casing and spaced therefrom to provide a passageway therebetween, and a fan to cause air to pass through said passageway in direct Contact With said inner casing.

8. A dynamo-electric machine, comprising a stator provided with a laminated core having an end ring arranged upon each end thereof and a shell arranged around the outer edges of its laminations in engagement therewith and overlapping said end rings and welded to the outer peripheries thereof, a closed end plate arranged upon each of said end rings and forming with Y said stator a closed inner casing to exclude ambient diiusible matter from theinterior of said machine, a rotor arranged Within said stator and having its shaft bearing in' said end plates, an 80' outer casing arranged around said inner casing and spacedrtherefrom to provide a passageway therebetween, a fan casing formed integral with said outer casing, and a fan arranged'withn said Y fan casing to cause air to pass throughsaid passageway in direct contact with said inner casing.

HAROLD L. SMITH. FRANK J. RATHBUN. ALFRED M. FORMAN. n 

